This is actually great. The possibilities are vast: saving prematurely born babies, speeding up the healing process of patients with severe burns...and then even (maybe) bringing back to life some of the extinct species (this one's tricky though).
I wonder what the implications of functioning artificial wombs would be to abortion. Would it make sense to allow people to abort if we could take the fetus from the mother and let it become a baby?
If/when that becomes feasible, I assume moving the fetus to the artificial womb would become a more humanitarian (if more expensive) equivalent to getting an abortion.